Heater for aquaria



FIG. 1 is a perspective view of a heater for aquaria according to the present design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

CLAIM The ornamental design for a heater for aquaria, as shown. 